Investigators previously searched the park after the father of 5-year-old Aramazd Andressian Jr. was found passed out there on April 22. Sheriff's officials say the father took prescription pills and was in a car doused in gasoline.

The father was initially arrested on suspicion of child endangerment but later released.

On Wednesday the boy's mother, Ana Estevez, joined sheriff's officials to make a public plea for her son's safe return.

Authorities say the boy was last seen with his father at Disneyland on April 20.